Let's not overlook Philippe Pétain or Marshal Pétain who headed the collaborationist French government in Vichy during WW II. He deserves at least as much "credit" as Quisling. It would be fascinating to hear an expert like Dr. Beard explain why Quisling's name became synonymous with treachery, while Pétain's name fell into obscurity, except perhaps in France.
When one flower whithers, another blooms.